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What is Star Delta
Starter for Motor Starting? Star-Delta starter is an electrical
motor starting device, generally uses in big size motor to overcome some
technical limitation. Star and Delta means here 2 separate states of motor
running, first Star connection and then Delta connection. The starting current of any heavy
electric motor can be more than 4 times the normal load current it draws when
it has gained speed and has reached its normal running condition. To overcome
this initial high current enchanting problem, such arrangement needs Star
connection at starting time and if Star connection has sufficient torque to run
up to 75% to %80 of full load speed, then the motor can be connected in Delta
mode. When the motor connected to Delta
configuration the phase voltage increases by 173% and phase currents increase
by the same ratio. The line current increases three times its value in star
connection. What Problem
Starting Motor without Star-Delta?We already know, if the motor starts
si…

History
of Wind Power Generation:In early, people learn to use wind as a power
sources, sailing boats or ships have been using wind power for at least 5,500
years. In 17th century BC, the Babylonian emperor Hammurabi used wind
power for irrigation work. Greek engineer Heron of Alexandria used wind to
drive wheel to power for a machine in 1st century AD, Ancient Tibet
and China also learned to use wind power since 4th century for speeding
grain crushing and water pumping.

Development
of Wind Power:From antiquity, middle-ages to modern 21th century;
using of wind power changed widely, modern technology shaping wind power to
generate electricity. In early 20th century, Denmark did remarkable
development in wind power to produce electricity, by 1908 there were 72 wind-driven
electric generator having capacity 5kW to 25kW. A gigantic change took place in 1978; multi
megawatt wind turbine was constructed for first time. Now for magic action of
modern technology many multinational companies…

3 Phase Electrical
Distribution Board DB Wiring Procedure To
understand and wiring an electrical distribution board, first of all you have
to clear understanding about DB or Distribution Board wiring definition and systems
as per international and local standard. Here you will find some basic idea
about Distribution Board and its types. What Distribution Board (DB) Is?A safe electrical
system designed for a house or premises that included isolation switches, protective
devices, connecting of multiple cable circuits including their associated neutral
and earth conductors. Distribution Boards are normally following three (3)
types- Main Distribution
Board (MDB):The
Distribution Board which in generally receive incoming source of Low Voltage
(LV) from transformer secondary of customer or the distribution company’s
service outlets. MDB is the first receiving point (bus bar) from Transformer or
Distribution Company. The MDB
may also be known as the ‘Consumer Unit’ where the main isolation de…

What Is Corona Effects in Electrical Energy
Transmission Line?If you look along the
high voltage power transmission line in a clear sky night, you will observe a
dreamiest violet glow phenomenon embedded hissing noise along the transmission
line conductors. This indefinable phenomenon causes nothing but a production of
ozone gas surrounding on overhead electrical energy transmission lines is
known as Corona or corona effect. Usually you will find noticeable corona effects in EHV
or Extra High Voltage transmission lines, like- 230kV, 400kV or higher grading.
You may discover corona effects on medium voltages line if line overloaded or
carry overestimated loads.

What is the Advantages and Disadvantages of Corona
Effects?The advantages of corona effects are- I) because of
corona formation surrounding the conductor, virtually the conductor diameter
becomes larger. As the diameter increases the electrostatic stress between the
conductor decreases; ii) it reduces the surge voltag…

Pipe and Valve Select and Erect Accordance with Standard Manner All piping should be designed, manufactured and tested in accordance with British Standards or equivalent Nationals Standards approved by the Engineer. In particular, pipe work should meet the requirements of the following standards or their equivalents. Dimensions should comply with Table 1 of BS 1600. The minimum wall thickness of carbon steel pipes excluding any allowance for corrosion should be as shown in British Standards:

DiameterMinimum Wall Thickness00 - 100 mm 150 - 200 mm250 - 600 mmTable 2 BS 1387:19674.87 mm6.35mmDrains and air vents should be provided as required by the physical arrangement of the pipe work and should be via valves with the drain and vent pipe work led to drain points to the approval of the Engineer. Screwed pipe work systems should be provided with adequate unions to enable valves and fittings to be removed if required with minimum disturbance to the rest of the pipe system. Perfect Valves Se…

Here in this article we would like to present a sample
type test report on complete underground power cable:

Bending test
in accordance with IEC 60840, clause 12.3.3

A cable sample of approximately 40 m was bent
six times around a test cylinder with a maximum diameter of (25 x (d+D) +5%) at
ambient temperature. The results are stated in annex A. For a picture of the
bending test reference is made to annex G.

After the bending test and short duration test the
cable samples were examined for partial discharges in accordance with IEC
60885-3 at ambient temperature. The sensitivity of the measuring circuit was
checked with a calibrator, the noise level was < 2 pC. The voltage was
first raised to and held to 133 kV (1, 75 Uo) for 10 s and then lowered to 114
kV (1, 5 Uo). At this voltage the partial discharges were measured. For the
results re…

Bangladeshi all Newspaper List
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aBBangladeshi all national and regional newspaper in one page, you can read by single click.

All Bangla Regional Newspaper
You also find Bangladeshi all regional newspapers. If you find missing your-one, please feel free to comments below, we will try to include. We want to present you all Bangla newspaper in one page, read any one by single click.

What Is A Buchholz Relay?Buchholz relay is safety device to protect a transformer from internal faults, like- impulse breakdown of the transformer insulating oil or transformer coil turns insulation failure etc. Buchholz relay in the field of power transmission and distribution system is a kind of relay that is little different from other conventional relays. Buchholz relay also a safety device that mounted on large size (normally more than 500kVA) oil immersed transformer reactor and equipped with conservator or overhead oil reservoir. Buchholz relay was first developed by Max Buchholz in 1921. What is Buchholz in chess? “The Buchholz system (also spelled Buchholtz) is a ranking or scoring system inchess developed by Bruno Buchholz (died ca. 1958) in 1932, for Swiss system tournaments (Hooper & Whyld 1992). ... It was probably first used in the 1932 Bitterfeld tournament.”

Working Principle Of Buchholz RelayIt is interesting that transformer is an electrical equipment but protec…

How to wire your home smartly? Yes, Engineering Science and Technology teaching us to be smart everywhere in our life. So, before going to building a new home or remodeling your existing one; you must think about smart house-wiring like others smart gadget. Smart house-wiring means not only how to wire cables for automation, but also to be think about different theories of automation wirings, popular and international or local house-wiring standard protocols etc. The aim of this article to introduce our self with definition of smart wiring system and the most broadly accepted useful smart house-wiring techniques based on data communication & telephony system, Television & Media server system, Security & Closed circuit camera system, Alarms & Fire detection systems and hubing with many more upcoming technological smart gadgets.

What Smart Wiring Is?If you guy is not an electrician, smart wiring means wiring having everything dealing with wiring; like- switching the lighti…

This article will help you to understand the basic concept of Energy, Energy sources and How different forms of energy changes to electrical energy. In below link you will get pdf copy where briefly described about-

Advantages of Solid Fuels Over Liquid Fuels.Basic Concept of Energy:We are
surrounded by Energy. Energy is
everywhere and it surrounds us; but we can’t touch it and also can’t measure
its mass, because it is mass less. However, we can see and feel the effects of
energy on many materials. The word energy came from the Greek Energeia, meaning in or at work.

Energy is the
ability or capability to do work; Energy cannot be created or destroyed.

We
cannot create or destroyed any energy, for our use we only can change the form
or…

Most Read Post in This Blog

What is Star Delta
Starter for Motor Starting? Star-Delta starter is an electrical
motor starting device, generally uses in big size motor to overcome some
technical limitation. Star and Delta means here 2 separate states of motor
running, first Star connection and then Delta connection. The starting current of any heavy
electric motor can be more than 4 times the normal load current it draws when
it has gained speed and has reached its normal running condition. To overcome
this initial high current enchanting problem, such arrangement needs Star
connection at starting time and if Star connection has sufficient torque to run
up to 75% to %80 of full load speed, then the motor can be connected in Delta
mode. When the motor connected to Delta
configuration the phase voltage increases by 173% and phase currents increase
by the same ratio. The line current increases three times its value in star
connection. What Problem
Starting Motor without Star-Delta?We already know, if the motor starts
si…

Bangladeshi all Newspaper List
(adsbygoogle = window.adsbygoogle || []).push({});
aBBangladeshi all national and regional newspaper in one page, you can read by single click.

All Bangla Regional Newspaper
You also find Bangladeshi all regional newspapers. If you find missing your-one, please feel free to comments below, we will try to include. We want to present you all Bangla newspaper in one page, read any one by single click.

3 Phase Electrical
Distribution Board DB Wiring Procedure To
understand and wiring an electrical distribution board, first of all you have
to clear understanding about DB or Distribution Board wiring definition and systems
as per international and local standard. Here you will find some basic idea
about Distribution Board and its types. What Distribution Board (DB) Is?A safe electrical
system designed for a house or premises that included isolation switches, protective
devices, connecting of multiple cable circuits including their associated neutral
and earth conductors. Distribution Boards are normally following three (3)
types- Main Distribution
Board (MDB):The
Distribution Board which in generally receive incoming source of Low Voltage
(LV) from transformer secondary of customer or the distribution company’s
service outlets. MDB is the first receiving point (bus bar) from Transformer or
Distribution Company. The MDB
may also be known as the ‘Consumer Unit’ where the main isolation de…

In a simple and shortly we can say surge arrester or lightning arrester is a device used in electrical power system to protect others equipment from switching surges or high energy lightning surges.

If you are hearing the terms “lightning arrester” or “surge arrester” very first time and thinking, it’s like something “police arrest terrorist”! Yes, you not quite wrong; lightning or surge like a destructive terrorist for electrical power system, surge arrester works like a police man, catch it and send to ground before destruct the system equipment.Don’t confuse lightning or surge arrester with lightning rod, surge suppressor or TVSS. Lightning Rod is a grounded potential device that divert the lightning surge;Suppressor is a lightning diverter device that uses in low voltage (below 1000V) system; TVSS is Transient Voltage Surge Suppressor used for divert the transient surge in low voltage (below 100v) system.

Electricity Myths Can be a KillerThere are lots of juicy myths on various subjects like earthquake, eclipse, etc. in almost every nations; but fact is that electricity myths are not jukes or fun, just a little mistake can cause of severe electrical shock, burn or even death!! If you don’t sure or without advice from electrician, do not believe any myth on electricity. To know the fact contact your nearest electricity utility company or any electrical professional or electrician. Our post on electricity myth and fact may not be juicy or folky but will give you some important information that will help to use safe electricity as well as save your electricity. Myths and Facts on Electrical SafetyMyth: Power lines are insulated, no chance to shock. Fact: Most of the powerlines are not insulated and insulated powerlines also can lost their insulation any time very easily. Myth:This line is safe because it is not high voltage line. Fact: Actually high voltage is n…

Procedure of Earth Electrode
Resistance Measurement by Digital Earth Tester: To ensure the system with
good earthed and not buried within the resistance area of others electrode. Earth
resistance requirements for all systems are not same, but everywhere it is
required to keep less to fulfil the system requirements. Now we are going to measure
the earth electrode or grounding rod resistance measurement by Earth Tester.
Previously, earth tester was totally horrible, manual or hand rotating DC
generator type, receiving accurate reading was difficult. Right now lots of
Digital Earth Testers are available in the market.
Measuring the Earth Electrode resistance we test actually to- Test the earth electrode
resistance;Ascertain the suitability of
the location of the electrode;Ensure that the electrode is
not buried within the resistance area of another electrode. Test Equipment Ranges:We are using simple digital
Earth Tester having Red-Yellow-Green 3 test cord; two test spikes, total Ohm range
…

Who will ensure the Industrial Labour Laws for Construction Labor at Site To ensure the industrial labour laws for employee of construction industry should follow the general laws as, the Service Provider must include for the provision of all necessary supervisory skilled and unskilled labour for erecting, testing and commissioning the works, together with all necessary transport, accommodation where required and other services to support his supervisory and labour force to meet the specified work completion. A staff tree of the Service Provider’s site organization for carrying out the agreed work should be set out in the schedules. The Service Providers forecast site staffing levels are to be submitted in a bar chart showing the duration of stay of each member. This bar chart will not form any limiting factor on the quantities of staff to be provided. How Labour Facilities Denoted in Employer- Contractor Agreement The Agreement Terms and Condition between Employer and Service Provider f…

History
of Wind Power Generation:In early, people learn to use wind as a power
sources, sailing boats or ships have been using wind power for at least 5,500
years. In 17th century BC, the Babylonian emperor Hammurabi used wind
power for irrigation work. Greek engineer Heron of Alexandria used wind to
drive wheel to power for a machine in 1st century AD, Ancient Tibet
and China also learned to use wind power since 4th century for speeding
grain crushing and water pumping.

Development
of Wind Power:From antiquity, middle-ages to modern 21th century;
using of wind power changed widely, modern technology shaping wind power to
generate electricity. In early 20th century, Denmark did remarkable
development in wind power to produce electricity, by 1908 there were 72 wind-driven
electric generator having capacity 5kW to 25kW. A gigantic change took place in 1978; multi
megawatt wind turbine was constructed for first time. Now for magic action of
modern technology many multinational companies…